Catalyst, preparation method of catalyst and method for denitrification of high-temperature flue gas from coal combustion
A high-temperature flue gas and coal combustion technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of NH3 escape, high operation and maintenance costs, and catalyst failure, so as to avoid secondary pollution. Secondary pollution, low operation and maintenance costs, and stable performance
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Embodiment 1
[0020] A catalyst according to an embodiment of the present invention includes: a carbon material carrier; an active material, including a composite rare earth oxide loaded on a carbon material carrier, wherein the total loading amount of the composite rare earth oxide on the carbon material carrier is 1% -3%.
[0021] The catalyst contains a carbon material carrier, and the carbon-containing substance can be 2 Reducing NOx when it exists, the carbon material carrier will not volatilize and escape, the material is easy to obtain, and has stable physical and chemical properties, large specific surface area, high porosity, etc., and stable performance. Therefore, the catalyst of this embodiment has low operation and maintenance costs. Low cost, wide source, non-toxic and other characteristics, it is suitable as a reducing agent for NOx removal. Under certain conditions, the catalyst can almost completely remove NOx in flue gas.
[0022] Further, the composite rare earth oxide i...
Embodiment 2
[0024] The preparation method of the catalyst according to the embodiment of the present invention is used to prepare the catalyst in Example 1, comprising: dissolving the composite rare earth nitrate crystal in pure water according to the preset loading amount to prepare a catalyst precursor, and then adding the carbon material to the above-mentioned Put the prepared precursor solution together in a microwave oven for microwave hydrothermal synthesis for 10 minutes, the complex rare earth nitrate in the solution crystallizes out and loads it on the carbon material, and bakes it at 500-700°C for 3-4h under an inert atmosphere, so that The compound rare earth nitrate is decomposed into a compound rare earth oxide to form a catalyst.
[0025] The raw material of the method for preparing the catalyst is easy to obtain, the process is stable and the price is cheap.
Embodiment 3
[0027] The method for denitrification of high-temperature flue gas from coal combustion according to an embodiment of the present invention includes: placing the catalyst in Embodiment 1 in the tail flue of the boiler.
[0028] At a temperature of 600°C-800°C, the simulated flue gas containing nitric oxide and nitrogen was passed into the semi-coke denitration catalyst sample prepared above, and the iron-cerium composite oxide was loaded, and the denitration efficiency was tested. The results are shown in Table 1. Show,
[0029] Table 1
[0030]
[0031] It can be seen from Table 1 that the catalyst placed in the tail flue of the boiler has good catalytic activity in the temperature range of 600-800°C, and the denitrification conversion rate in the furnace can reach more than 80%. The method uses a flue as a reactor, has simple equipment, does not require subsequent process equipment, has low investment, low energy consumption, and good denitrification effect. The whole p...
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